IUTAM Symposium on Variable Density Low-Speed Turbulent Flows

I. Instabilities.- Instabilities and bifurcations in variable density flows.- Global self-excited oscillations in a two-dimensional heated jet : a numerical simulation.- Mixing behavior of absolutely unstable axisymmetric shear layers forming side jets.- Influence of density contrast on instability and mixing in coaxial jets.- A wake behind a heated cylinder at small Mach numbers : bifurcations of the vortex street and potentialities of acoustic diagnostics.- Experimental study of the Benard-Karman instability downwind of a heated cylinder.- Direct simulation of multiphase flows with density variations.- Self-turbulent flame simulation by a cellular automaton.- II. Modelling and Experiments.- Some problems on single point modelling of turbulent, low-speed, variable density fluid motions.- Turbulent kinetic energy in variable density jets and the modelling issue.- Second-order turbulence modelling and numerical simulation of volume variable turbulent flows.- Second order modelling of variable density jets : Favre averaged closures versus Reynolds averaged closures.- Averaging procedures for the large eddy simulation of variable density flows.- Numerical predictions of mixing phenomena in turbulent variable density flows with second-order closure turbulence models.- Variation of the effective nozzle diameter in round turbulent jets with variable density.- Mixing in coaxial jets with large density differences.- Forces on bodies moving in a weak density gradient without buoyancy effects.- Experimental investigation of the interaction between scalar dissipation and strain rate in a counterflow geometry.- Analytical solution of the equation for the probability density function of a scalar in decaying grid-generated turbulence with a uniform mean scalar gradient.- Pdf and highest concentration evolution in turbulent jets.- III. Modelling and Experiments. Buoyancy Effects.- Turbulent transfer modelling in turbulent flows with density variations and buoyancy forces.- Buoyancy-generated variable-density turbulence.- Turbulence structure and its modelling of a natural convection boundary layer.- Turbulent structure in horizontal channel flow under unstable density stratification.- Second order modelling of incompressible turbulent buoyant flows : some comments on the maximum principle.- Variable density effects in axisymmetric turbulent jets and diffusion flames.- Numerical modelling of turbulent convective heat and mass transfer in two-layer systems.- An experimental investigation of quasi-2D turbulence with or without buoyancy effects.- Penetrative convection in water near 4°C.- IV. Modelling and Experiments. Industrial Applications.- Studying and modelling variable density turbulent flows for industrial applications.- V. Experiments and Measurement Methods.- Optical diagnostics for flows with density variations.- Large scale characterisation of the concentration field of supercritical jets of hydrogen and methane.- Unsteady measurement of static pressure, velocity and temperature in the vicinity of the nozzle in a vacuum-wind-tunnel.- Improvement of the response of a fine cold-wire for the measurement of high-frequency temperature fluctuations.- Measurements of velocity in the turbulent stage of gaseous mixtures induced by shock waves.- VI. Compressible Flows.- Flows with density variations and compressibility: similarities and differences.- Balance of kinetic energy in a supersonic mixing layer compared to subsonic mixing layer and subsonic jets with variable density.- Compressibility versus density variations and the structure ofturbulence : a viewpoint from experiments.- A numerical method for computing flows for arbitrarily small and medium Mach numbers.- On density and pressure fluctuations in uniformly sheared compressible flow.- A structural approach to the effects of compressibility in turbulent flows subjected to external compression or high shear.- Conclusion.- Concluding remarks.- List of Participants.- Author Index.